Abstract
AbstractThe monoclinic form of BDNT‐PF6 (m‐BDNT‐PF6) is characterized as a pseudo‐one‐dimensional half‐filled Hubbard system from the electrical conductivity, magnetic susceptibility, and single crystal optical spectra. m‐BDNT‐PF6 undergoes a spin‐Peierls transition at about 150 K. The lattice dimerization was confirmed by the evolution of the vibronic modes at low temperature. The small polaron binding energy of this compound, which was estimated through the analysis of the vibronic modes, is smaller than those of TTF, TCNQ, or CA. Hubbard parameters U and t were obtained to be 0.8 and 0.13eV by analyzing the charge‐transfer band. The optical and magnetic data are consistent with each other.
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